The parasitic worms that cause river blindness give birth to 1,600 larvae each day. “I’ve heard people say that they feel this buzzing under the skin; they feel the little larvae under the skin and it’s itchy,” says Elodie Ghedin, a molecular parasitologist at New York University. The larvae then travel to various parts of the body, including the eyes, where they cause inflammation and lesions when they die.
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